Siemens LU01 instruction manual P651 Sound Velocity Calibration, Offset Calibration

Before using this feature, verify the following parameters are correct:

•Empty (P006)

•Temperature (P664)

•Offset Reading (P062)

Offset Calibration

Begin with a steady level.

1.Press TRANSDUCER to display the calculated reading.

2.Repeat Step One at least five times to verify repeatability.

3.Measure the actual reading (use tape measure).

4.Enter the actual value.

The deviation between the entered Empty (P006) value and the calibrated Empty value is stored in Offset Correction (P652).

P651 Sound Velocity Calibration

Changes the speed of sound constant.

Values	Range: -999 to 9999
Related	•	P653	Velocity
	•	P654	Velocity at 20°C

Condition for use of this feature

•The acoustic beam atmosphere is other than air

•The acoustic beam atmosphere temperature is unknown

•The Reading accuracy is acceptable at higher material levels only

For best results, calibrate with the level at a known value near empty.

Using Sound Velocity Calibration

Ensure a steady level at some low value (P653 and P654 adjusted accordingly)

1.Allow sufficient time for the vapor concentration to stabilize.

2.Press TRANSDUCER to display the calculated reading.

3.Repeat Step Two at least five times to verify repeatability.

4.Measure the actual reading (e.g. with a tape measure).

5.Enter the actual value.

Repeat this procedure if the atmosphere type, concentration, or temperature conditions are different from when the last sound velocity calibration was performed.

Note: In gasses other than air, the temperature variation may not correspond with the speed of sound variation. Turn off temperature sensor and use a fixed temperature.

Parameters

7ML19985BE02 SITRANS LU01 – INSTRUCTION MANUAL Page 55